1. The importance of sewage treatment

Resource recovery: By effectively treating sewage, useful substances such as fertilizers can be recovered and the consumption of natural resources can be reduced.

Prevention of environmental pollution: Untreated or improperly treated sewage discharged directly into the natural environment will seriously damage the water quality and affect biodiversity.

Safeguard public health: remove pathogens and other harmful substances from sewage to avoid the spread of human diseases caused by water pollution.

Promote sustainable development: Reasonable and effective sewage treatment measures will help to build an environment-friendly society and promote sustained and healthy economic and social development.

2. Basic process

Pretreatment stage

Grille filtration: first, use grilles with different thicknesses to remove large pieces of garbage and suspended matter.

Grit chamber: heavy inorganic particles are precipitated to reduce the burden of subsequent treatment units.

Main processing stage

Primary sedimentation: let the sewage stand for a period of time, and most organic solid substances settle to the bottom to form sludge during this process.

Biochemical treatment:

Activated sludge process: using microorganisms to decompose soluble and colloidal organic pollutants in water.

Biofilm method: microorganisms such as bacteria attach to the biofilm formed on the surface of the filler and purify the sewage through metabolism.

Secondary precipitation: further remove the residual suspended solids after biochemical treatment.

Post-treatment and disinfection stage

Filtration: Sand filtration and activated carbon adsorption are used to further remove fine impurities.

Disinfection: Chlorination, ultraviolet irradiation and other methods are usually used to kill the residual pathogenic bacteria to ensure the safety of effluent.

3. Conclusion

To sum up, scientific and standardized sewage treatment can not only improve the quality of ecological environment, but also promote the effective utilization of resources and the sustainable development of social economy. In the future, with the support of new technologies, we expect more efficient, low-cost and environment-friendly sewage treatment schemes to emerge continuously, contributing to the construction of beautiful homeland.